US3601731A - Coil form for a magnetic deflection york - Google Patents

Coil form for a magnetic deflection york Download PDF

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Publication number
US3601731A
US3601731A US7275A US3601731DA US3601731A US 3601731 A US3601731 A US 3601731A US 7275 A US7275 A US 7275A US 3601731D A US3601731D A US 3601731DA US 3601731 A US3601731 A US 3601731A
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United States
Prior art keywords
core
yoke
windings
slots
portions
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US7275A
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English (en)
Inventor
William R Christiana
Joseph F Hevesi
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International Business Machines Corp
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International Business Machines Corp
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
    • H01J29/70—Arrangements for deflecting ray or beam
    • H01J29/72—Arrangements for deflecting ray or beam along one straight line or along two perpendicular straight lines
    • H01J29/76—Deflecting by magnetic fields only
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
    • H01F41/06—Coil winding
    • H01F41/071—Winding coils of special form
    • H01F2041/0711—Winding saddle or deflection coils
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2209/00—Apparatus and processes for manufacture of discharge tubes
    • H01J2209/236—Manufacture of magnetic deflecting devices
    • H01J2209/2363—Coils
    • H01J2209/2366—Machines therefor, e.g. winding, forming, welding, or the like

Definitions

  • a magnetic deflection yoke has internal longitudinal slots and two end caps. Each of the end caps has hook members to allow a deflection yoke to be wound with each wire in each coil being precisely positioned to reduce deflection distortion.
  • the core may be cylindrical or tapered in shape.
  • a flattened trumpet-shaped wire feeder is used for feeding wire under tension between the end caps and hooking the wire behind them.
  • the present invention relates to precision coil structures and methods for winding such structures and, in particular, to an improved configuration for deflection coils in magnetic deflection yokes and a method for winding a precisely defined magnetic deflection yoke.
  • Deflection coils for electron beams normally include longitudinal portions, radial portions, and transverse portions.
  • the longitudinal portions are generally along the axis of the electron beam device such as a cathode-ray tube.
  • Current through the longitudinal portions produces a component of magnetic field that is transverse to the axis of the beam which causes a deflection of the beam.
  • Current flowing through the radial portions and the transverse portions of deflection coils produce components of magnetic field axially directed which tends to defocus the electron beam.
  • a usual production technique in the manufacture of magnetic deflection yokes is to wind the coils on a bobbin device separate from the yoke core and then'fit the coils onto the core.
  • such magnetic deflection yokes do not have predictable magnetic field patterns.
  • Imprecision in the deflection coils results in various distortionswhen an image is displayed on the face of a cathode-ray tube.
  • One is the defocusing of the spot and changes in its shape at positions away from the center of the CRT, and another is the lack of perpendicularity between the x and y components due to the imprecise placement of the x and y deflection coils with respect to each other.
  • a further object is to wind deflection coils on an internally slotted core structure with end caps arranged to achieve a high degree of repeatability among a large number of coils produced.
  • a still further object of the present invention is to reduce.
  • Another object of the present invention is to provide a lowcost magnetic deflection yoke which will produce a predictable magnetic field for deflecting an electron beam.
  • the instant invention' is embodied in a magnetic deflection yoke including a plurality of deflection coils and in a method for making a magnetic deflection yoke.
  • a deflection yoke in which deflection coils are precisely placed in slots in the core and held in precise position by a numberof hook members affixed at either end of the core, is wound as follows:
  • Thecore with end caps affixed is mounted on a winding 2.
  • a wire is fed under tension along one of the slots in the core;
  • the wire is fed under tension axially along another slot to the opposite end of the core;
  • the wire is then hooked around a hook member on the other end cap; 7.
  • the core is later rotated through an angle 26; and 8.
  • the steps are repeated through slots flanking the first pair, and so on.
  • the hook members on the end caps define annular channels which'place and maintain the end turns of the coils in tight transverse bundles positioned to minimize interference with the useful components of the operating fields of the yoke.
  • FIGS. 2 and 3 are detail views of the front and rear end cap structures of the yoke of FIG. 1.
  • FIG. '4 shows apparatus for winding deflection coils for a magnetic deflection yoke according to the instant invention.
  • FIGS. 5A and 5B show enlarged front and side views of the wire-feeding tool of FIG. 4, used to feed wire around the end caps of the deflection yoke.
  • FIG. 6A shows the shape of a single turn of a deflection coil wound according to the present invention.
  • FIG. 6B shows a multiple turn section of a deflection coil wound according to the present invention.
  • FIG. 7 is a cross section view of a cylindrical-shaped magnetic deflection yoke according to another embodiment of the present invention.
  • FIG. 1 a magnetic deflection yoke with a tapered core is shown as one embodiment of the present invention.
  • Yoke includes a core structure which isflared outwardly towards the front, and includes al ferromagnetic body and slotted'end caps and 130. Windings 50 are shown in phantom to reveal the core structure details.
  • End cap 120 includes hook members 124, and an extension 126 which forms a core liner having longitudinal slots 122.
  • Rear end cap 130 abuts with extension 126 and body 110 and is positioned so that the slots in extension 126 are in alignment with the slots in rear end cap 130.
  • Rear end cap 130 includes hook members 134 for holding the windings 50 precisely in position.
  • Each of the arrays of hooks 120 and 130 defines an annular channel 136, 138 for receiving the end turns of coils 50.
  • End caps 120 and 130 are formed of phenolic or hard plastic material.
  • the extended slots in end cap I20 are aligned with the slot formed between hook members 134 in end cap 130 and cemented in place.
  • the hook members 124 on end cap 120 and 134 on end cap 130 enable precise positioning of each turn of each coil in a magnetic deflection yoke.
  • FIG. 7 an alternate embodiment of the present invention is shown in which the yoke 140 is cylindrical in shape.
  • the end caps 142, 143 are identical and the windings 148 lie in a plane parallel to the undeflected direction of. electron beam in slots formed in the ferromagnetic core body.
  • FIG. 7 also illustrates an alternative composition of the core wherein the core is composed-of interleaved sections 145 of magnetic materials with sections 146 of nonmagnetic material to modify the magnetic flux pattern produced by the deflection yoke.
  • the nonmagnetic sections 146 are slotted as well as the magnetic sections 145 of the core and these slots must be aligned with each other and with the slots in end caps 142 and 143 to allow precise positioning of the deflection coils.
  • FIGS. 1 and 7 are given as examples, and that either could be constructed with features, such as the composite core or the plastic liner, of the other.
  • the core structure could be of the air core kind, in which the entire tooth, slot and liner assembly is nonmagnetic.
  • FIG. 4 a fixture is shown which may be used to automatically wind deflection coils on a yoke frame such as shown in FIGS. 1 and 7.
  • Yoke 100 is mounted on fixture 290.
  • the yoke is rotatable by motor 280, which is mounted on slides 255 hung from baseplate 250.
  • Wire 205 is fed from spool 210 through guide 220 to slidehead 230 carrying a tool 240' which has a hole drilled through it to allow the wire to pass.
  • Slidehead 230 is reciprocally mounted on track 232 and connected to driving rod 236 by coupler 234.
  • Driving rod 236 imparts linear motion to slidehead 230 along track 232 to cause feeding head 300 of tool 240 to move along the axis of the yoke.
  • Motor 280 is connected to fixture 290 by shaft 281 which passes through a slot 251 in plate 250.
  • Means not shown cause the motor 280 to move along slides 255 in the z axis perpendicular to the page to move yoke 100 in order to allow feeding head 300 to clear hook members 134 on rear end cap 130 and hook members 124 on end cap 120.
  • feeding toolhead 300 is shown with trumpet-shaped end 310 which enables reversing the direction of the wires around the end caps of the core assembly, and trough 320 which guides the wire during the winding ofa deflection coil.
  • the wire is fed through slot 315 at the rear of the feeding tool 300 and out through hole 316 to trough 320.
  • a cylindrical yoke embodiment of the present invention is shown mounted on the neck 150 of a CRT.
  • the trumpetor flare-shaped yoke 100 mounts on a CRT in the same manner as the cylindrical yoke 140.
  • the flared yoke 100 is capable of being positioned further up on the bell 151 of the CRT.
  • Feeding tool 300 feeds wire 205 under tension from a terminal (not shown) along a slot formed by end cap 120. For example, the first wire might be placed in slot 2. Feeding tool 300 proceeds beyond the lower end cap 130 to clear the teeth and any wire bundle previously built up in the trough 138. The fixture 290 is then displaced in the z axis to allow the feeding tool to clear hook members 134 radially, and then theprobe is retracted slightly to place the feedhead in line with annular trough 138. Motor 280 then indexes yoke 100 through an angle 8 which aligns feeding tool with another of the slots, for example, slot f.
  • Feeding tool 300 hooks the wire under tension around the hook member 134 in the lower end cap and the tool 300 is again lowered to clear the teeth.
  • the fixture is then displaced along the z axis to align the feeding tool with the yoke axis again.
  • the feeding tool 300 is then withdrawn drawing the wire under tension along slot f until the tool is clear of the upper end cap 120.
  • the fixture is then displaced in the z and vertical axes to allow the feeding tool 300 to clear the hook members 124 in the upper end cap 120 analogously to the aforedescribed hooking motions.
  • Motor 280 again indexes the yoke 100 through an angle 8 and a second turn is wound in slots 2 and f. After a specified number of turns are wound in slots e and f, the yoke is indexed through angle 8+8 and the wire is then fed downwardly under tension along slot d.
  • fixture 290 When feeding tool 300 is clear of the end cap 130, fixture 290 is displaced along the vertical and z axes as before to allow the feeding tool to clear the hook members 134 on end cap 130.
  • Motor 280 rotates the yoke through an angle 36 causing the wire under tension to be fed behind the hooks of the end cap to the next slot, in the example, slot g.
  • the wire is then fed under upwardly tension along slot g to the upper end of the yoke-clear of end cap 120, and the fixture is rotated by motor 280 back through the angle 38 to slot d.
  • each of the coils is wound in sequence nd the wire ends are brought to terminals (not shown) for connection to the deflection circuitry.
  • each coil covers nearly 180, and so the vertical and horizontal coils will overlap in the annular channels 136, 138.
  • the hook members 120 can be provided with secondary toothlike projections (not shown) dividing the channels 136, 138 into subchannels to separate the end turns of the vertical and horizontal coils.
  • the inventive method is equally applicable to winding deflection coils by hand since the preformed slots precisely position the wire and the hook members hold the end portion of the winding securely in posi tion.
  • FIG. 6A shows a skeleton view of the overall which produce of a coil as aforedescribed
  • FIG. 6B shows how the winding segments in theslots b through j cooperate to form the overall coil pattern.
  • Longitudinal portion 16 is the portion of each coil which lies in the slot along the axis of the core.
  • Radial portion 15 represents the portion of the coils which are perpendicular to the axis of the core and which hook behind the hook members of the end caps.
  • Transverse portions 17 are those parts of the windings that are designated by angle 0 and which produce no useful deflection component. Transverse portions 17 are maintained in a position perpendicular tothe axis of the yoke and outwardly displaced from portions 16 to avoid undesired end effects.
  • a yoke constructed according to the present invention will produce predictable magnetic fields with reduced spot focusing and distortion.
  • An electromagnetic deflection yoke for deflecting an electron beam comprising:
  • first and second end caps one of said end caps at each end of said core portion, wherein said end caps comprise a plurality of book members separated by a plurality of slots, said plurality of slots being aligned to form troughs along the axis of said core portion;
  • said core portion comprises magnetic core material formed with a plurality of longitudinal slots spaced around the inner perimeter of said magnetic core.
  • said first end cap further comprises an extension which includes a plurality of troughs formed by slots along the inner surface of said extension, said extension being mounted on the inner perimeter of said magnetic core body.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Formation Of Various Coating Films On Cathode Ray Tubes And Lamps (AREA)
  • Manufacture Of Motors, Generators (AREA)
US7275A 1970-01-30 1970-01-30 Coil form for a magnetic deflection york Expired - Lifetime US3601731A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US727570A 1970-01-30 1970-01-30

Publications (1)

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US3601731A true US3601731A (en) 1971-08-24

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US7275A Expired - Lifetime US3601731A (en) 1970-01-30 1970-01-30 Coil form for a magnetic deflection york

Country Status (11)

Country Link
US (1) US3601731A (es)
JP (1) JPS4923050B1 (es)
AT (1) AT312065B (es)
BE (1) BE761704A (es)
CH (1) CH526202A (es)
DE (1) DE2103679C3 (es)
ES (1) ES387645A1 (es)
FR (1) FR2090468A5 (es)
GB (1) GB1327489A (es)
NL (1) NL170199C (es)
SE (1) SE367277B (es)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3801941A (en) * 1972-01-13 1974-04-02 Plessey Handel Investment Ag Coil winding
US3895329A (en) * 1973-12-19 1975-07-15 Gen Electric Toroidal-like saddle yoke
US3902674A (en) * 1973-11-09 1975-09-02 Gen Instrument Corp Core supporting and rotating assembly
US3980242A (en) * 1973-05-29 1976-09-14 Quasar Electronics Corporation Coil winding machine for toroidal cores employing core holder assembly
US3996542A (en) * 1975-04-14 1976-12-07 Rca Corporation Deflection yoke having nonradial winding distribution
US4023129A (en) * 1975-04-14 1977-05-10 Rca Corporation Deflection yoke with non-radial conductors
US4081773A (en) * 1975-04-16 1978-03-28 International Standard Electric Corporation Groove ring for toroidal-coil deflection unit
US4117432A (en) * 1975-01-17 1978-09-26 Denki Onkyo Co., Ltd. Deflection yoke with unitary coil frame
US4359705A (en) * 1979-10-09 1982-11-16 Siemens Aktiengesellschaft Deflection unit for cathode ray tubes
US4901930A (en) * 1988-07-21 1990-02-20 Tdk Corporation Winding apparatus for deflection yoke
US5828278A (en) * 1995-01-18 1998-10-27 Sony Corporation Deflection system
US20020185956A1 (en) * 2001-06-07 2002-12-12 Fumio Abe Deflection yoke
EP3640962A1 (en) * 2018-10-15 2020-04-22 V&C GmbH Automatic hook needle winding machine

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2807978C2 (de) * 1978-02-24 1992-08-27 Standard Elektrik Lorenz Ag, 7000 Stuttgart Ablenkjoch für eine Kathodenstrahlröhre
JPS5635645U (es) * 1979-08-23 1981-04-06
JPS57116972U (es) * 1981-01-14 1982-07-20
NL8603056A (nl) * 1986-12-01 1988-07-01 Philips Nv Werkwijze voor het vervaardigen van een elektromagnetische afbuigeenheid en elektronenstraalbuis met aldus vervaardigde afbuigeenheid.
DE3920699A1 (de) * 1989-06-24 1991-01-10 Nokia Unterhaltungselektronik Sattelspulenanordnung fuer eine kathodenstrahlroehre und spulentraeger fuer eine solche anordnung

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3310763A (en) * 1965-02-04 1967-03-21 Rca Corp Deflection yoke coil
US3430169A (en) * 1965-10-23 1969-02-25 Sanders Associates Inc Deflection yoke

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3310763A (en) * 1965-02-04 1967-03-21 Rca Corp Deflection yoke coil
US3430169A (en) * 1965-10-23 1969-02-25 Sanders Associates Inc Deflection yoke

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3801941A (en) * 1972-01-13 1974-04-02 Plessey Handel Investment Ag Coil winding
US3980242A (en) * 1973-05-29 1976-09-14 Quasar Electronics Corporation Coil winding machine for toroidal cores employing core holder assembly
US3902674A (en) * 1973-11-09 1975-09-02 Gen Instrument Corp Core supporting and rotating assembly
US3895329A (en) * 1973-12-19 1975-07-15 Gen Electric Toroidal-like saddle yoke
US4117432A (en) * 1975-01-17 1978-09-26 Denki Onkyo Co., Ltd. Deflection yoke with unitary coil frame
US3996542A (en) * 1975-04-14 1976-12-07 Rca Corporation Deflection yoke having nonradial winding distribution
US4023129A (en) * 1975-04-14 1977-05-10 Rca Corporation Deflection yoke with non-radial conductors
US4081773A (en) * 1975-04-16 1978-03-28 International Standard Electric Corporation Groove ring for toroidal-coil deflection unit
US4359705A (en) * 1979-10-09 1982-11-16 Siemens Aktiengesellschaft Deflection unit for cathode ray tubes
US4901930A (en) * 1988-07-21 1990-02-20 Tdk Corporation Winding apparatus for deflection yoke
US5828278A (en) * 1995-01-18 1998-10-27 Sony Corporation Deflection system
US20020185956A1 (en) * 2001-06-07 2002-12-12 Fumio Abe Deflection yoke
US6882097B2 (en) * 2001-06-07 2005-04-19 Mitsubishi Denki Kabushiki Kaisha Deflection yoke
EP3640962A1 (en) * 2018-10-15 2020-04-22 V&C GmbH Automatic hook needle winding machine

Also Published As

Publication number Publication date
BE761704A (fr) 1971-07-01
DE2103679B2 (de) 1974-01-31
SE367277B (es) 1974-05-20
NL170199C (nl) 1982-10-01
AT312065B (de) 1973-12-10
NL170199B (nl) 1982-05-03
GB1327489A (en) 1973-08-22
DE2103679A1 (de) 1971-08-05
JPS4923050B1 (es) 1974-06-13
ES387645A1 (es) 1974-01-16
FR2090468A5 (es) 1972-01-14
NL7100491A (es) 1971-08-03
CH526202A (de) 1972-07-31
DE2103679C3 (de) 1974-08-22

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